Influence of cation type on deterioration process of cement paste in sulfate environment
Influence of cation type on deterioration process of cement paste in sulfate environment
复制标题
硫酸盐环境下阳离子类型对水泥净浆劣化过程的影响
DOI：
10.1016/j.conbuildmat.2014.08.042
复制
发表时间：
2014-11
影响因子：
7.4
通讯作者：
Hongqiang Chu
中科院分区：
文献类型：
--
作者：
Zijian Song;Rong Liu;Lushen You;Hongqiang Chu
本研究的目的是考察阳离子类型对水泥浆体在外加硫酸盐侵蚀下劣化过程的影响。通过显微硬度试验(维氏硬度)、抗压强度试验和膨胀试验进行了试验。选择硫酸盐浓度为5.0wt%的Na2SO4、K2SO4、(NH4)2SO4和MgSO4溶液作为硫酸盐侵蚀水泥浆体的来源。测定了含有不同硫酸盐的溶液的pH值，以支持分析。分析了水泥净浆试件浸泡在不同侵蚀液中的劣化过程。结果表明，浸泡在不同硫酸盐溶液中的水泥浆体的维氏硬度下降速率一般顺序为：Na2SO4-≈-K2SO4>；随着暴露时间的增加，硫酸盐的影响程度不同，劣化速度也不同。浸泡在含有Na2SO4、K2SO4、MgSO4和(NH4)2SO4的溶液中的样品在一定的曝光时间范围内发生了两个阶段的膨胀。此外，不同硫酸盐的抗压强度与维氏硬度有很好的相关性。
The objective of this study is to examine the influence of cation type on deterioration process of cement paste exposed to external sulfate attack. The experiment was carried out by micro-hardness test (Vickers hardness), compressive strength test and expansion test. Solutions respectively containing Na2SO4, K2SO4, (NH4)2SO4and MgSO4with sulfate concentration of 5.0 wt% were chosen as the sources of sulfate to attack the cement paste. The pH values of solutions containing different sulfate salts were measured to support the analysis. The deterioration process of the cement paste specimens immersed in different attacking solutions was analyzed. The results shown that, the reducing rate of Vickers hardness of cement paste samples immersed in solutions containing different sulfate salts were generally sequenced as Na2SO4≈ K2SO4> MgSO4> (NH4)2SO4. With the addition of exposure time, the deterioration process exerted at different rate with the variation of sulfate salts. The expansion of specimens immersed in solutions containing Na2SO4, K2SO4, MgSO4and (NH4)2SO4occurred in two stages within a certain range of exposure time. Besides, compressive strength appeared to be well correlated with Vickers hardness for different kinds of sulfate salts.
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影响因子：
11.4
作者：
Nehdi, M. L.;Suleiman, A. R.;Soliman, A. M.
通讯作者：
Soliman, A. M.
影响因子：
11.4
作者：
Park, YS;Suh, JK;Shin, YS
通讯作者：
Shin, YS
影响因子：
11.4
作者：
Santhanam, M;Cohen, MD;Olek, J
通讯作者：
Olek, J
DOI：
10.1061/(asce)0899-1561(2001)13:3(216
发表时间：
2001-06
影响因子：
3.2
作者：
K. Kurtis;K. Shomglin;P. Monteiro;J. Harvey;J. Roesler
通讯作者：
K. Kurtis;K. Shomglin;P. Monteiro;J. Harvey;J. Roesler
影响因子：
10.5
作者：
A. Bonakdar;B. Mobasher;N. Chawla
通讯作者：
A. Bonakdar;B. Mobasher;N. Chawla